When a person with astigmatism looks at straight lines, they appear distorted. Why does this happen, and what can be done about it?

Distorted vision of straight lines in astigmatic eyes may be caused by insufficient visual adaptation, improper eyeglass use, keratoconus, keratitis, corneal ulcers, or other factors. It is recommended to seek timely medical attention, identify the underlying cause, and receive symptomatic treatment under the guidance of a qualified physician. Detailed analysis is as follows:

1. Insufficient visual adaptation: In the initial phase of wearing astigmatism-correcting glasses, the eyes require some time to adapt to the new visual environment. During this period, patients may perceive straight lines as distorted, which is a relatively normal phenomenon. This can often be improved gradually by increasing the duration of glasses wear over time.

2. Improper eyeglass use: Inaccurate lens prescriptions or incorrect pupillary distance measurements can easily lead to the aforementioned symptoms. Patients are advised to visit reputable optical stores or medical institutions for professional refraction and eyeglass fitting to ensure lens quality and accuracy.

3. Keratoconus: A condition characterized by thinning and forward protrusion of the central cornea into a cone-like shape, possibly related to chronic eye rubbing or genetic factors. This disease causes irregularities on the corneal surface, disrupting light refraction and leading to the described visual distortions. Additional symptoms may include declining vision and worsening astigmatism. Patients should seek prompt medical care and may benefit from treatments such as wearing corrective eyeglasses or rigid gas-permeable contact lenses.

4. Keratitis: May be associated with microbial infections, diabetes, or other systemic conditions. Localized inflammation can make the corneal surface uneven, affecting light refraction and causing visual distortion, along with symptoms such as eye pain and photophobia. Patients should follow medical advice and use medications such as methylprednisolone tablets, levofloxacin eye drops, or acyclovir eye drops as prescribed.

5. Corneal ulcer: Usually caused by viral or bacterial infections. The condition often leads to an irregular corneal surface, resulting in the aforementioned visual disturbances and possible eye redness. Patients should strictly follow medical instructions and use medications such as ganciclovir eye drops, tobramycin eye drops, and vitamin C tablets to alleviate symptoms.

In daily life, patients are encouraged to perform regular eye exercises—such as alternating focus between near and distant objects—and maintain good ocular hygiene. Avoid rubbing the eyes to help reduce discomfort and promote eye health.